Focus on the black dot in the middle. Eventually you should see circles forming around this. This is a display of persistance of vision. Press shift+Green flag to see the effect. Use the stamping button to see what your brain would see if a) it was spinning fast enough and b) the graphics system kept up. This project is an example of rotational graphics updating. I have put a graphics effect on it so you can see what it is doing. This principal is how those radar things you see in films work. As the antennae turns, the bar changes depending on where the planes are and the screen keeps the dots, fading out until updating.
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